What's Underneath ― Yoshinao TakisakaEssays by Yoshinao Takisaka (瀧坂義尚).https://yoshinaotakisaka.com/en-GBThe Blind Spot of the Double Diamond ― A Tentative Argument for the Double Iceberg Modelhttps://yoshinaotakisaka.com/en/double-iceberg-model/https://yoshinaotakisaka.com/en/double-iceberg-model/A tentative model overlaying the Iceberg (tacit / explicit) on the Double Diamond (divergence / convergence). Reads Discover / Define / Develop / Deliver across two registers ―― surfacing eight fields, six failure patterns, and the geometry of diamond shapes.Fri, 22 May 2026 00:00:00 GMTDesignDouble DiamondTacit KnowledgeDesign TheoryMethodologyKnowledge ManagementProject ManagementEssayWhat Completes Software ― Pain-Driven Software Developmenthttps://yoshinaotakisaka.com/en/pain-driven-software-development/https://yoshinaotakisaka.com/en/pain-driven-software-development/In an age when AI can prototype anything, why does software still refuse to be finished? Drawing on the author's own macOS app, CONTXXXT, this essay proposes Pain-Driven Software Development (PDSD) — building software from one's own pain rather than market analysis.Tue, 19 May 2026 00:00:00 GMTAISoftware DevelopmentProduct DevelopmentPersonal SoftwarePain-Driven DevelopmentEssayDiamond is Unbreakable ― The Work of Crystallising Decisional Knowledge in the Age of AIhttps://yoshinaotakisaka.com/en/knowledge-diamond/https://yoshinaotakisaka.com/en/knowledge-diamond/As AI promises to fully automate business operations, one job remains with humans: crystallising an organisation's criteria for judgment. Drawing on daily work as a marketer, this essay maps what AI cannot inherit ―― what we call "success," and how we decide the next move.Sun, 17 May 2026 00:00:00 GMTAIDecision MakingKnowledge ManagementMarketingManagementEssay